static const char* normal_rb_swap_texture_fragment_shader = STRINGIFY(
                                                              uniform sampler2D sampler;
                                                              varying lowp vec2 texCoordVarying;
                                                              void main()
{
    lowp vec4 color = texture2D(sampler, texCoordVarying);
    gl_FragColor = vec4(color.b, color.g, color.r, color.a);
}
                                                              );